Blue's Clues is an American children's television series airing on the Nickelodeon family of channels.
The series takes place inside a world in which everything is made of paper cutouts, clay, and other craft materials.
It is presented by a live-action human host who lives in a yellow house inhabited by anthropomorphic everyday objects.
Co-creator Traci Paige Johnson voices the title character, an animated, blue-spotted dog named Blue who communicates through distinctive barks.
In the sixth season, she is granted a magic playroom called Blue's Room in which she can interact with the viewer and a cast of live-action puppet characters.
Whenever he finds a clue, he draws it on a pocket-sized pad of paper called the Handy Dandy Notebook.
In the reboot series Blue's Clues & You!, Steve has since graduated from college and now runs the Blueprints Detective Agency (BDA) and appears as a recurring character.
He owns a Handy Dandy Notebook similar to Steve's, but it is larger and shaped like the Thinking Chair.
In the reboot series Blue's Clues & You!, Joe now runs the Present Store and appears as a recurring character.
Mailbox (voiced by Michael Rubin, who is normally credited under the stage name Seth O'Hickory in the original series and Doug Murray in the reboot series) is a cheerful and purple mailbox who lives at the foot of the pathway in front of the Blue's Clues house.
In each episode, Mailbox delivers a letter or informs an incoming e-mail after the host sings a special, Western-style song called "Mailtime" ("Post Time" in the UK) and sits on the Thinking Chair.
Originally, Mailbox has a thick Brooklyn accent but now he doesn't have it; he likes to crack jokes, he wants to be a comedian when he grows up and he also has a collection of postage stamps.
In the UK, these eponymously named anthropomorphic kids' construction toys are called "Spade" and "Bucket".
Tickety Tock, usually called Tickety for short, (voiced by Kathryn Avery from 1996 to 2001 and by Kelly Nigh from 2001 to 2004 in the original series and by Ava Augustin in the reboot series from seasons one to four and Maja Vujicic in season five) is an alarm clock who lives on a nightstand in the bedroom of the Blue's Clues house.
Slippery Soap, usually called Slippery for short, (voiced by Cody Ross Pitts from 1996 to 2001, Patrick Van Wagenen from 2001 to 2003, and Sean Hanley in 2004 in the original series and Jacob Soley in the reboot series from seasons one to four and Lexi Perri in season five) is a lavender-colored bar of soap who lives in the bathroom of the Blue's Clues house.
He dreams of becoming the captain of a boat when he grows up and likes to wear a blue sailor cap with an anchor emblem on it.
In the original series, Slippery, Shovel, and Pail were the only main non-human characters with permanent eyebrows.
Periwinkle, or simply Peri for short, (voiced by Cameron Bowen from 2000 to 2001, by Kenny Kim from 2001 to 2003, and by Jansen Panettiere in 2004, and Luxton Handspiker from 2021 to 2022 in the reboot series and currently by Peter Laurie since 2023) is a male kitten from the city.